A saliency map in primary visual cortex
I propose that pre-attentive computational mechanisms in primary visual cortex create a saliency map. This map awards higher responses to more saliency image locations. These responses are those of conventional V1 cells tuned to input features, such as orientation and color.
Hence no separate feature maps, or any subsequent combination of them, is needed to create a saliency map. I use a model to show that this saliency map accounts for the way that the
relative difficulties of visual search tasks depend on the features and spatial configurations
of targets and distractors. This proposal links psychophysical behavior to V1 physiology and
anatomy, and thereby makes testable predictions.
Trends in Cognitize Sciences. 6(1) p9- 16 (2002)
A more recent paper, Zhaoping 2005, (describing this theory) in which some
conceptual points were elaborated for better understanding.
Back to Zhaoping Li's Home Page,
A webpage on Early Vision Theory,